Flue gas distribution and control system for coke oven flue gas recirculation technology

Abstract

The present invention relates to chemical equipment and discloses a flue gas distribution and control system for a coke oven flue gas recirculation technology, comprising a flue gas exhaust pipeline (1), a flue gas circulation pipeline (2), and a circulation fan (3) connected therebetween; the flue gas exhaust pipeline is connected to the gas outlet of a waste gas switch (4), the flue gas circulation pipeline is connected to the gas inlet of the waste gas switch, and the flue gas exhaust pipeline is also connected to a chimney; a flue gas flow sensor and a flue gas concentration sensor are provided in the flue gas exhaust pipeline, the flue gas flow sensor and the flue gas concentration sensor are connected to a controller, and the controller is connected to the circulation fan to control the circulation fan to start when the flue gas flow is less than or the flue gas concentration is greater than a set value. The flue gas distribution and control system for the coke oven flue gas recirculation technology of the present invention has a simple structure and a high degree of automation.

Description

Technical Field

[0001] The present invention relates to chemical equipment, in particular to a flue gas distribution and control system for a coke oven flue gas recirculation technology. Background Art

[0002] As people's demand for environmental protection increases, in the process of chemical production, the treatment standards and requirements for emissions such as waste gas are becoming higher and higher. For example, the treatment of nitrogen oxides is extremely harmful to the environment and human body, so the treatment of tail gas containing nitrogen oxides is becoming more and more stringent.

[0003] The control of nitrogen oxides in coke oven flue gas is mainly carried out from two aspects: combustion process and terminal treatment. X Common measures for controlling NO (nitrogen oxides) include flue gas circulation, staged heating, and control of actual combustion temperature. Among them, flue gas circulation technology is a common method for controlling NO (nitrogen oxides) in the coke oven combustion process. X technology.

[0004] The main process principle of flue gas circulation is to return the flue gas after coke oven combustion to the coke oven combustion heating system, thereby reducing oxygen content, increasing air flow speed, lengthening flame, reducing fire channel temperature, and reducing NO X The amount of production has considerable benefits in reducing the operating costs of the denitrification device, and the flue gas circulation can speed up the air flow velocity in the vertical fire channel and lengthen the combustion flame, which is very beneficial to ensure the uniformity of heating the coke cake from top to bottom, and can effectively improve the production quality of coke, shorten the coking time to a certain extent, and reduce gas consumption while increasing output. Due to the special structure of the coke oven air inlet / exhaust system, the introduction of combustion air and the exhaust of post-combustion flue gas must pass through the coke oven exhaust gas switch, so the exhaust gas switch is the only interface for the coke oven air inlet / exhaust. Therefore, if the coke oven flue gas is to be recycled, it must also pass through the exhaust gas switch. In the existing technology, a new circulating flue gas waste gas block is generally added inside the original waste gas switch of the coke oven. However, this method is difficult to construct and requires opening two interfaces, one large and one small, on the waste gas switch. The large interface is connected to the circulating flue gas branch pipe, and the small interface is the passage for the waste gas block chain. This will completely destroy the original insulation structure of the switch, and the opening work of the switch needs to be carried out under the condition of normal operation of the coke oven, which poses a high safety risk.

[0005] In view of this, it is necessary to provide a flue gas distribution and control system for a coke oven flue gas recirculation technology. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a flue gas distribution and control system for a coke oven flue gas recirculation technology, which has a simple structure and a high degree of automation.

[0007] In order to solve the above technical problems, the present invention provides a flue gas distribution and control system of a coke oven flue gas recirculation technology, including a flue gas exhaust pipeline and a flue gas circulation pipeline, the flue gas exhaust pipeline and the flue gas circulation pipeline are connected via a circulation fan; the flue gas exhaust pipeline is connected to the air outlet of the exhaust gas switch, the flue gas circulation pipeline is connected to the air inlet of the exhaust gas switch, and the flue gas exhaust pipeline is also connected to the chimney; a flue gas flow sensor and a flue gas concentration sensor are provided in the flue gas exhaust pipeline, the flue gas flow sensor and the flue gas concentration sensor are connected to a controller, and the controller is connected to the circulation fan to control the circulation fan to turn on when the flue gas flow in the flue gas exhaust pipeline is less than a set value or the smoke concentration is greater than a set value, and the flue gas flows into the flue gas exhaust pipeline via the air outlet of the exhaust gas switch, and enters the coke oven through the circulation fan, the flue gas circulation pipeline and the air inlet of the exhaust gas switch in sequence.

[0008] Specifically, two adjacent exhaust shutters form an opening and closing group, so that when the air inlet of the odd-numbered exhaust shutter is opened, the air inlet of the even-numbered exhaust shutter is closed.

[0009] More specifically, the flue gas exhaust pipeline includes a main flue gas exhaust pipeline and multiple flue gas exhaust branches, and the flue gas circulation pipeline includes a main flue gas circulation pipeline and multiple flue gas circulation branches. The number of the flue gas exhaust branches and the flue gas circulation branches is consistent with the number of the exhaust gas switch; each of the flue gas exhaust branches is connected to the air outlet of the corresponding exhaust gas switch, and each of the flue gas circulation branches is connected to the air inlet of the corresponding exhaust gas switch, and the number of each flue gas circulation branch is consistent with the number of the exhaust gas switch.

[0010] More specifically, each of the flue gas circulation branches is provided with a branch control valve, and the branch control valve is connected to the controller. When the controller controls the branch control valve on the odd-numbered flue gas circulation branch to open, it controls the branch control valve on the even-numbered flue gas circulation branch to close; and when the controller controls the branch control valve on the odd-numbered flue gas circulation branch to close, it controls the branch control valve on the even-numbered flue gas circulation branch to open.

[0011] More specifically, the controller is capable of controlling the opening and closing degree of the branch pipe control valve.

[0012] Furthermore, a waste gas block is provided at the connection between each of the flue gas circulation branches and the air inlet of the waste gas switch, and the number of the waste gas block is consistent with the number of the waste gas switch, so that the air inlet of the waste gas switch can be opened and closed by raising and lowering the waste gas block.

[0013] Optionally, the odd-numbered exhaust gas banks are connected to the first exhaust gas bank pull rod, and the even-numbered exhaust gas banks are connected to the second exhaust gas bank pull rod. The first exhaust gas bank pull rod is connected to the first drive device, and the second exhaust gas bank pull rod is connected to the second drive device. Both the first drive device and the second drive device are connected to the controller. When the controller controls the first drive device to drive the first exhaust gas bank pull rod to make the odd-numbered exhaust gas banks descend, it controls the second drive device to drive the second exhaust gas bank pull rod to make the even-numbered exhaust gas banks rise. When the controller controls the first drive device to drive the first exhaust gas bank pull rod to make the odd-numbered exhaust gas banks rise, it controls the second drive device to drive the second exhaust gas bank pull rod to make the even-numbered exhaust gas banks descend.

[0014] Further optionally, the two exhaust gas blocks of each opening and closing group are connected via a chain, the chain is set on a pulley set and connected to the exhaust gas block pull rod, the exhaust gas block pull rod is connected to a driving device, and the driving device is also connected to the controller, so that when the controller controls the driving device to drive the exhaust gas block pull rod so that the odd-numbered exhaust gas blocks rise, the even-numbered exhaust gas blocks fall, and when the controller controls the driving device to drive the exhaust gas block pull rod so that the even-numbered exhaust gas blocks rise, the odd-numbered exhaust gas blocks fall.

[0015] Specifically, the pulley group includes odd-numbered pulleys and even-numbered pulleys. The odd-numbered pulleys are arranged above the odd-numbered exhaust gas blocks, and the even-numbered pulleys are arranged above the even-numbered exhaust gas blocks. One end of the chain is connected to the odd-numbered exhaust gas blocks, and the other end passes through the odd-numbered pulleys and the even-numbered pulleys in sequence and is connected to the even-numbered exhaust gas blocks.

[0016] Optionally, a pressure sensor is provided in each of the flue gas circulation branches.

[0017] Through the above technical solution, the flue gas distribution and control system of the coke oven flue gas recirculation technology provided by the present invention directly connects the flue gas exhaust pipeline and the flue gas circulation pipeline through the circulation fan, so that the flue gas exhausted from the coke oven can directly enter the coke oven again under the action of the circulation fan to realize circulation, and when the circulation fan is working, the flue gas exhaust pipeline can also play the role of absorbing air, so that the circulating flue gas can be mixed with the air and enter the coke oven together, so that the actual amount of air added during the entire coking process is reduced, and the generated flue gas can be reused, thereby achieving the purpose of reducing flue gas emissions. During the flue gas circulation process, due to the amount of mixed air Less, that is, less oxygen, therefore, the total amount and concentration of nitrogen oxides generated can also be reduced, and the pollution to the environment is small. In the above structural design, the flue gas circulation pipeline not only plays the role of a circulation pipeline, but also plays the role of an air intake pipeline, making the structure of the flue gas distribution and control system of the coke oven flue gas recirculation technology more compact; in addition, a flue gas flow sensor and a flue gas concentration sensor are arranged in the flue gas exhaust pipeline to be able to monitor the flue gas flow and flue gas concentration in the flue gas exhaust pipeline in real time, and the monitoring information can be fed back to the controller, so that the controller can control the start and stop of the circulation fan according to the flue gas flow or flue gas concentration, thereby realizing automatic control of the flue gas circulation.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of the flue gas distribution and control system of the coke oven flue gas recirculation technology of the present invention;

[0020] Figure 2 This is a schematic diagram of the connection between the exhaust gas switch, the flue gas exhaust pipeline, and the flue gas circulation pipeline in the flue gas distribution and control system of the coke oven flue gas recirculation technology of the present invention;

[0021] Figure 3 It is a schematic diagram of the waste gas block adjustment structure of the flue gas distribution and control system of the coke oven flue gas recirculation technology of the present invention.

[0022] Description of Reference Numerals

[0023] 1-Smoke exhaust pipeline 11-Smoke exhaust main pipeline

[0024] 12-Multiple flue gas exhaust branches 2-Flue gas circulation pipeline

[0025] 21-Flue gas circulation main pipeline 22-Multiple flue gas circulation branches

[0026] 221-Branch control valve 221 3-Circulation fan

[0027] 4- Exhaust gas switch 5- Exhaust gas block

[0028] 6-chain 7-exhaust tube pull rod

[0029] 8-Pulley Block 81-Odd Numbered Pulley

[0030] 82-Even Numbered Pulley DETAILED DESCRIPTION

[0031] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a direct connection or an indirect connection via an intermediate medium; they may refer to internal communication between two components or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0033] like Figure 1 As shown, in one embodiment of the flue gas distribution and control system of the coke oven flue gas recirculation technology provided by the present invention, the flue gas distribution and control system of the coke oven flue gas recirculation technology includes a flue gas exhaust pipeline 1 and a flue gas circulation pipeline 2, the flue gas exhaust pipeline 1 and the flue gas circulation pipeline 2 are directly connected via a circulation fan 3; the flue gas exhaust pipeline 1 is connected to the air outlet of the exhaust gas switch 4, the flue gas circulation pipeline 2 is connected to the air inlet of the exhaust gas switch 4, and the flue gas exhaust pipeline 1 is also connected to the chimney; a flue gas flow sensor (not shown in the figure) and a flue gas concentration sensor (not shown in the figure) are provided in the flue gas exhaust pipeline 1. The flue gas flow sensor and the flue gas concentration sensor are connected to the controller (not shown in the figure), and the controller is connected to the circulation fan 3 to control the circulation fan 3 to open when the flue gas flow in the flue gas exhaust pipeline 1 is less than the set value or the flue gas concentration is greater than the set value. The circulation fan 3 can be set to be able to adjust the power so as to be able to more accurately control the extended circulation amount. The flue gas flows into the flue gas exhaust pipeline 1 through the outlet of the exhaust gas shutter 4, and passes through the circulation fan 3, the flue gas circulation pipeline 2 and the air inlet of the exhaust gas shutter 4 in sequence to enter the coke oven; in order to reduce the NO generated during the coking process X (nitrogen oxides) as an example, it is necessary to measure the NO in the flue gas X (nitrogen oxides) content is detected, so the flue gas concentration sensor should be able to detect NO X (nitrogen oxides) sensor. Further, the controller controls the circulation fan 3 according to the following rules:

[0034] (1) If the actual circulating flue gas volume is greater than the set value, the power of the circulating fan 3 can be reduced to reduce the flue gas circulation volume and save unnecessary power consumption;

[0035] (2) If the actual circulating flue gas volume is less than the set value and the concentration of nitrogen oxides in the flue gas is higher than the set upper limit, the power of the circulating fan 3 needs to be increased to increase the flue gas circulation volume and reduce the concentration of nitrogen oxides to an acceptable range;

[0036] (3) If the actual circulating flue gas volume is less than the set value and the nitrogen oxide concentration in the flue gas is lower than the set lower limit, it proves that the low-nitrogen combustion operation has achieved good results. The power of the circulating fan 3 can be appropriately reduced to reduce the flue gas circulation volume.

[0037] Through the above technical solution, the flue gas distribution and control system of the coke oven flue gas recirculation technology provided by the present invention directly connects the flue gas exhaust pipe 1 and the flue gas circulation pipe 2 through the circulation fan 3, so that the flue gas exhausted from the coke oven can directly enter the coke oven again under the action of the circulation fan 3 to realize circulation, and when the circulation fan 3 is working, the flue gas exhaust pipe 1 can also play the role of absorbing air, so that the circulating flue gas can be mixed with the air and enter the coke oven together, so that the actual amount of air added in the entire coking process is reduced, and the generated flue gas can be reused, thereby achieving the purpose of reducing flue gas emissions. In the process of flue gas circulation, due to the mixed air The amount is small, that is, the amount of oxygen is small, therefore, the total amount and concentration of nitrogen oxides generated can also be reduced, and the pollution to the environment is small. In the above structural design, the flue gas circulation pipeline 2 not only plays the role of a circulation pipeline, but also plays the role of an air intake pipeline, making the structure of the flue gas distribution and control system of the coke oven flue gas recirculation technology more compact; in addition, a flue gas flow sensor and a flue gas concentration sensor are arranged in the flue gas exhaust pipeline 1 to be able to monitor the flue gas flow and flue gas concentration in the flue gas exhaust pipeline 1 in real time, and the monitoring information can be fed back to the controller, so that the controller can control the start and stop of the circulation fan 3 according to the flue gas flow or flue gas concentration, thereby realizing automatic control of the flue gas circulation.

[0038] Specifically, in the flue gas distribution and control system of the coke oven flue gas recirculation technology provided by the present invention, the exhaust gas switch 4 of the coke oven is usually set to multiple, and the exhaust gas switch 4 can be numbered in sequence, such as Figure 1 As shown, assuming Figure 1There are 8 exhaust shutters 4 shown in the upper part, and the exhaust shutters 4 are numbered 1, 2, 3, ..., 8 from left to right. Two adjacent exhaust shutters 4 can be further formed into an opening and closing group, so that when the air inlet of the odd-numbered exhaust shutter 4 is open, the air inlet of the even-numbered exhaust shutter 4 is closed, and when the air inlet of the odd-numbered exhaust shutter 4 is closed, the air inlet of the even-numbered exhaust shutter 4 is closed. The air inlet of the odd-numbered exhaust shutter 4 is opened, and the air inlet of the even-numbered exhaust shutter 4 is closed, the air outlets of all the exhaust shutters 4 are opened, and the smoke can be discharged into the smoke exhaust pipeline 1, and the air inlet of the odd-numbered exhaust shutter 4 is in the open state, and the air inlet of the even-numbered exhaust shutter 4 is in the closed state, and the smoke entering the smoke exhaust pipeline 1 can be discharged by the circulating The function of the circulating fan 3 is to enter the flue gas circulation pipeline 2, and can re-enter the coke oven through the air inlet of the odd-numbered exhaust gas switch 4 to realize the circulation of the flue gas; and when the air inlet of the odd-numbered exhaust gas switch 4 is closed and the air inlet of the even-numbered exhaust gas switch 4 is opened, the air outlets of all the exhaust gas switch 4 are opened, and can discharge the flue gas into the flue gas exhaust pipeline 1, and the air inlet of the odd-numbered exhaust gas switch 4 is in a closed state, and the air inlet of the even-numbered exhaust gas switch 4 is in an open state. The flue gas entering the flue gas exhaust pipeline 1 can enter the flue gas circulation pipeline 2 by the function of the circulating fan 3, and can re-enter the coke oven through the air inlet of the even-numbered exhaust gas switch 4 to realize the circulation of the flue gas. The above can make the air inlet position of the entire coke oven adjustable, so as to control the intake amount of the circulating flue gas while ensuring that the air intake in the coke oven is more uniform.

[0039] Specifically, in the flue gas distribution and control system of the coke oven flue gas recirculation technology provided by the present invention, in order to achieve the above-mentioned opening and closing effect of the air inlet, the flue gas exhaust pipeline 1 can be set to include a flue gas exhaust main pipeline 11 and multiple flue gas exhaust branches 12, and the flue gas circulation pipeline 2 can be set to include a flue gas circulation main pipeline 21 and multiple flue gas circulation branches 22, wherein the number of the smoke gas exhaust branches 12 and the smoke gas circulation branches 22 is consistent with the number of the waste gas openers and closeers 4, so that each smoke gas exhaust branch 12 can be connected to the air outlet of the corresponding waste gas opener and closeer 4, and each smoke gas circulation branch 22 can be connected to the air inlet of the corresponding waste gas opener and closeer 4 (the number of each smoke gas circulation branch 22 is consistent with the number of the waste gas opener and closeer 4), and each smoke gas circulation branch 22 can be connected to the air inlet of the corresponding waste gas opener and closeer 4 (the number of each smoke gas circulation branch 22 is consistent with the number of the waste gas opener and closeer 4), and A branch control valve 221 is set in the branch 22, and the branch control valve 221 is connected to the controller to realize the controller's control of the branch control valve 221. Specifically, when the controller controls the branch control valve 221 on the odd-numbered flue gas circulation branch 22 to open, the branch control valve 221 in the even-numbered flue gas circulation branch 22 is controlled to be closed; and when the branch control valve 221 in the odd-numbered flue gas circulation branch 22 is controlled to be closed, the branch control valve 221 in the even-numbered flue gas circulation branch 22 is controlled to be opened. The setting method makes the overall structure of the flue gas circulation pipeline 2 simple, occupies a small space, and can also facilitate the adjustment of the opening and closing of each flue gas circulation branch 22, but the layout cost of the branch control valve 221 is relatively high.

[0040] It can be understood that in order to reduce the usage of the branch control valve 221 to save costs, the flue gas circulation pipeline 2 can be set to include odd-numbered flue gas circulation main pipelines and multiple odd-numbered flue gas circulation branches connected to the odd-numbered flue gas circulation main pipelines, as well as even-numbered flue gas circulation main pipelines and multiple even-numbered flue gas circulation branches connected to the even-numbered flue gas circulation main pipelines, wherein the number of odd-numbered flue gas circulation main pipelines is consistent with the number of odd-numbered exhaust gas switches 4, and the number of even-numbered flue gas circulation branches is consistent with the number of even-numbered exhaust gas switches 4, so that each odd-numbered flue gas circulation main pipeline and each odd-numbered flue gas circulation branch can have a corresponding exhaust gas switch 4 The air inlet of the flue gas circulation main pipeline is connected, and a main control valve can be set on the odd-numbered flue gas circulation main pipeline and the even-numbered flue gas circulation main pipeline, and the main control valve is connected to the controller to realize the controller's control of the main control valve. Specifically, when the controller controls the main control valve in the odd-numbered flue gas circulation main pipeline to open, the main control valve in the even-numbered flue gas circulation main pipeline is controlled to close; and when the controller controls the main control valve in the even-numbered flue gas circulation main pipeline to open, the main control valve in the odd-numbered flue gas circulation main pipeline is controlled to close, so that fewer control valves can be used to realize the control of the opening and closing of the air inlet (whether the air inlet can take in air), thereby greatly saving costs.

[0041] Of course, it can be understood that no matter which of the above two forms is used to control the opening and closing of the air inlet, the branch control valve 221 (mother control valve) can also be set to be able to control the degree of its opening and closing by the controller, thereby adjusting the air intake volume (intake pressure) so that the intake pressure can be within a safe range, and the size of the air intake volume can be adaptively adjusted according to the process of the coking reaction or the amount of the reactants, thereby ensuring the safety of the coking furnace.

[0042] Specifically, in the flue gas distribution and control system of the coke oven flue gas recirculation technology provided by the present invention, as Figure 2 and Figure 3 As shown, each flue gas circulation branch 22 and the air inlet of the exhaust gas switch 4 can be provided with an exhaust gas block 5. The number of the exhaust gas block 5 is consistent with the number of the exhaust gas switch 4, and the exhaust gas switch 4 can be opened and closed by lifting the exhaust gas block 5. Specifically, the odd-numbered exhaust gas block 5 can be connected to the first exhaust gas block pull rod, and the even-numbered exhaust gas block 5 can be connected to the second exhaust gas block pull rod. The first exhaust gas block pull rod is connected to the first drive device, and the second exhaust gas block pull rod is connected to the second drive device. The first drive device and the second drive device are both connected to the controller. When the controller controls the first drive device to drive the first exhaust gas block pull rod to make the odd-numbered exhaust gas block 5 descend, it controls the second drive device to drive the second exhaust gas block pull rod to make the even-numbered exhaust gas block 5 rise; and when the controller controls the first drive device to drive the first exhaust gas block pull rod to make the odd-numbered exhaust gas block 5 rise, it controls the second drive device to drive the second exhaust gas block pull rod to make the even-numbered exhaust gas block 5 descend. Since this structure requires the provision of at least two pull rods and at least two drive devices, the overall structure of the control system for controlling the exhaust gas block 5 is relatively complex, occupies a large space, and has a high manufacturing cost.

[0043] It is understandable that in order to reduce the cost of the control system for controlling the waste gas pile 5, in the flue gas distribution and control system of the coke oven flue gas recirculation technology provided by the present invention, as shown in FIG. Figure 3 As shown, the two exhaust lumps 5 in each opening and closing group can be connected via a chain 6, which is set on a pulley set 8 and connected to the exhaust lumps pull rod 7, and the exhaust lumps pull rod 7 is connected to a driving device (not shown in the figure), and the driving device is also connected to a controller, so that when the controller controls the driving device to drive the exhaust lumps pull rod 7 so that the odd-numbered exhaust lumps 5 rise, the even-numbered exhaust lumps 5 fall, and when the controller controls the driving device to drive the exhaust lumps pull rod 7 so that the even-numbered exhaust lumps 5 rise, the odd-numbered exhaust lumps 5 fall. Specifically, as shown in FIG. Figure 3As shown, the pulley group 8 can be configured to include odd-numbered pulleys 81 and even-numbered pulleys 82, wherein the odd-numbered pulleys 81 are arranged above the odd-numbered exhaust gas blocks 5, and the even-numbered pulleys 82 are arranged above the even-numbered exhaust gas blocks 5. One end of the chain 6 is connected to the odd-numbered exhaust gas blocks 5, and the other end is connected to the even-numbered exhaust gas blocks 5 through the odd-numbered pulleys 81 and the even-numbered pulleys 82 in sequence. The structural design of the pulley group 8 enables the driving device to drive the exhaust gas block pull rod 7 to pull the chain 6 to achieve the movement of the exhaust gas blocks 5 at both ends of the chain 6 with only a small force, which can greatly save energy, and can simplify the overall structure of the control system for controlling the exhaust gas blocks 5, which can effectively save costs.

[0044] It can be understood that both the waste gas block 5 and the branch pipe control valve 221 (or the mother road control valve) can realize the distribution of waste gas, that is, the regulation of the waste gas flow direction, but relatively speaking, the waste gas block 5 has a better sealing effect and can ensure the sealing of the air inlet when it is closed, while the branch pipe control valve 221 (or the mother road control valve) can easily adjust the degree of opening and closing, and can easily realize the regulation of the internal pressure of the pipeline. Therefore, in order to better realize the regulation of the internal pressure of the flue gas circulation pipeline 2 and ensure the sealing of the air inlet when it is closed, as shown in FIG. Figure 2 As shown, on the basis of the above-mentioned technical solution of setting the waste gas block 5, a branch control valve 221 can be set in each flue gas circulation branch 22, and a pressure sensor (not shown in the figure) can be set in each flue gas circulation branch 22, wherein the waste gas block 5 plays a role in controlling the opening and closing of the air inlet, and can adjust the opening and closing degree of the branch control valve 221 manually or by a controller through the pressure in the pipeline measured by the pressure sensor, so as to play a role in adjusting the pressure in the pipeline and the flow of waste gas to the air inlet.

[0045] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, the technical solution of the present invention may be subjected to a variety of simple modifications, including combining the various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. A flue gas distribution and control system for coke oven flue gas recirculation technology, characterized in that: The invention comprises a smoke exhaust pipeline (1) and a smoke circulation pipeline (2), wherein the smoke exhaust pipeline (1) and the smoke circulation pipeline (2) are connected via a circulation fan (3); the smoke exhaust pipeline (1) is connected to the air outlet of the exhaust gas switch (4), the smoke circulation pipeline (2) is connected to the air inlet of the exhaust gas switch (4), and the smoke exhaust pipeline (1) is also connected to the chimney; a smoke flow sensor and a smoke concentration sensor are provided in the smoke exhaust pipeline (1), and the smoke The flow sensor and the flue gas concentration sensor are connected to a controller, and the controller is connected to the circulating fan (3) to control the circulating fan (3) to start when the flue gas flow in the flue gas exhaust pipeline (1) is less than a set value or the flue gas concentration is greater than a set value, so that the flue gas flows into the flue gas exhaust pipeline (1) through the air outlet of the exhaust gas shutter (4), and enters the coke oven through the circulating fan (3), the flue gas circulation pipeline (2) and the air inlet of the exhaust gas shutter (4) in sequence; When the actual circulating flue gas volume is greater than the set value, the power of the circulating fan (3) is reduced; When the actual circulating flue gas volume is less than the set value and the nitrogen oxide concentration in the flue gas is higher than the set upper limit, the power of the circulating fan (3) is increased; When the actual circulating flue gas volume is less than the set value and the nitrogen oxide concentration in the flue gas is lower than the set lower limit, the power of the circulating fan (3) is reduced; The flue gas circulation pipeline (2) includes a flue gas circulation main pipeline (21) and multiple flue gas circulation branches (22); A waste gas block (5) is provided at the connection between each of the flue gas circulation branches (22) and the air inlet of the waste gas shutter (4), and the number of the waste gas block (5) is consistent with the number of the waste gas shutter (4), so that the air inlet of the waste gas shutter (4) can be opened and closed by raising and lowering the waste gas block (5); The odd-numbered exhaust gas blocks (5) are connected to the first exhaust gas block pull rod, and the even-numbered exhaust gas blocks (5) are connected to the second exhaust gas block pull rod. The first exhaust gas block pull rod is connected to the first driving device, and the second exhaust gas block pull rod is connected to the second driving device. The first driving device and the second driving device are both connected to the controller. When the controller controls the first driving device to drive the first exhaust gas block pull rod to make the odd-numbered exhaust gas blocks (5) descend, the controller controls the second driving device to drive the second exhaust gas block pull rod to make the even-numbered exhaust gas blocks (5) rise. When the controller controls the first driving device to drive the first exhaust gas block pull rod to make the odd-numbered exhaust gas blocks (5) rise, the controller controls the second driving device to drive the second exhaust gas block pull rod to make the even-numbered exhaust gas blocks (5) descend.

2. The flue gas distribution and control system of the coke oven flue gas recirculation technology according to claim 1 is characterized in that: Two adjacent exhaust gas shutters (4) form an opening and closing group, so that when the air inlet of the odd-numbered exhaust gas shutter (4) is opened, the air inlet of the even-numbered exhaust gas shutter (4) is closed.

3. The flue gas distribution and control system of the coke oven flue gas recirculation technology according to claim 2 is characterized in that: The smoke exhaust pipeline (1) includes a smoke exhaust main pipeline (11) and multiple smoke exhaust branches (12), and the number of the smoke exhaust branches (12) and the smoke circulation branches (22) is consistent with the number of the exhaust gas switch (4); each of the smoke exhaust branches (12) is connected to the air outlet of the corresponding exhaust gas switch (4), and each of the smoke circulation branches (22) is connected to the air inlet of the corresponding exhaust gas switch (4), and the number of each of the smoke circulation branches (22) is consistent with the number of the exhaust gas switch (4).

4. The flue gas distribution and control system of the coke oven flue gas recirculation technology according to claim 3 is characterized in that: Each of the flue gas circulation branches (22) is provided with a branch control valve (221), and the branch control valve (221) is connected to the controller. When the controller controls the branch control valve (221) on the flue gas circulation branch (22) with an odd number to be opened, the controller controls the branch control valve (221) on the flue gas circulation branch (22) with an even number to be closed; and when the controller controls the branch control valve (221) on the flue gas circulation branch (22) with an odd number to be closed, the controller controls the branch control valve (221) on the flue gas circulation branch (22) with an even number to be opened.

5. The flue gas distribution and control system of the coke oven flue gas recirculation technology according to claim 4 is characterized in that: The controller is capable of controlling the opening and closing degree of the branch pipe control valve (221).

6. The flue gas distribution and control system of the coke oven flue gas recirculation technology according to claim 5, characterized in that: The two exhaust gas blocks (5) of each opening and closing group are connected via a chain (6), and the chain (6) is set on a pulley group (8) and connected to the exhaust gas block pull rod (7), and the exhaust gas block pull rod (7) is connected to a driving device, and the driving device is also connected to the controller, so that when the controller controls the driving device to drive the exhaust gas block pull rod (7) so that the odd-numbered exhaust gas blocks (5) rise, the even-numbered exhaust gas blocks (5) fall, and when the controller controls the driving device to drive the exhaust gas block pull rod (7) so that the even-numbered exhaust gas blocks (5) rise, the odd-numbered exhaust gas blocks (5) fall.

7. The flue gas distribution and control system of the coke oven flue gas recirculation technology according to claim 6, characterized in that: The pulley group (8) includes an odd-numbered pulley (81) and an even-numbered pulley (82), wherein the odd-numbered pulley (81) is arranged above the odd-numbered waste gas block (5), and the even-numbered pulley (82) is arranged above the even-numbered waste gas block (5). One end of the chain (6) is connected to the odd-numbered waste gas block (5), and the other end passes through the odd-numbered pulley (81) and the even-numbered pulley (82) in sequence to be connected to the even-numbered waste gas block (5).

8. The flue gas distribution and control system of the coke oven flue gas recirculation technology according to any one of claims 3 to 7, characterized in that: A pressure sensor is provided in each of the flue gas circulation branches (22).

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